Ray Tracing through the Edge Focusing of Rectangular Benders and an Improved Model for the Los Alamos Proton Storage Ring

Kolski, Jeffrey S.¹  Barlow, David B.¹  Macek, Robert J.¹  McCrady, Rodney C.¹ 

[1] Los Alamos National Laboratory

关键词: Accelerator Design;    Technology;    and Operations;    Particle Accelerators (43);    BENDING;    FOCUSING;    FORECASTING;    MAGNETIC FIELDS;    MAGNETS;    OPTICS;    PROTONS;    QUADRUPOLES;    RESPONSE MATRIX METHOD;    STORAGE RINGS;   

DOI  :  10.2172/1011078
RP-ID  :  LA-UR-11-10334
PID  :  OSTI ID: 1011078
Others  :  TRN: US1102157

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来源: SciTech Connect

【 摘 要 】

Particle ray tracing through simulated 3D magnetic fields was executed to investigate the effective quadrupole strength of the edge focusing of the rectangular bending magnets in the Los Alamos Proton Storage Ring (PSR). The particle rays receive a kick in the edge field of the rectangular dipole. A focal length may be calculated from the particle tracking and related to the fringe field integral (FINT) model parameter. This tech note introduces the baseline lattice model of the PSR and motivates the need for an improvement in the baseline model's vertical tune prediction, which differs from measurement by .05. An improved model of the PSR is created by modifying the fringe field integral parameter to those suggested by the ray tracing investigation. This improved model is then verified against measurement at the nominal PSR operating set point and at set points far away from the nominal operating conditions. Lastly, Linear Optics from Closed Orbits (LOCO) is employed in an orbit response matrix method for model improvement to verify the quadrupole strengths of the improved model.